Answer:
- The Five Stages of Sleep
1.) wake
2.) light
3.) sleep
4.) deep sleep
5.) REM, and repeat
Explanation:
- Each cycle moves sequentially through each stage of sleep
- Four to five 90 min cycles
- There are different phases of sleep as the night progresses
- Light / Deep sleep can be grouped together as NREM - Non-Rapid Eye Movement Referred to as (Stages 1 - 4)
- The last stage of sleep is (REM) Rapid Eye Movement / It can also be called "Stage R"
